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'''The diagram displayed below basically applies to every service that you learn shows how to work iptables can be used with in this coursea web-server:'''
::# For the ''response'' the '''source port is 80''' and the '''destination port is 40112'''
::# Since the '''RELATED,ESTABLISHED''' rule already exists, we are only concerned about controlling the '''incoming traffic on the server''', which in our example, the '''chain is: INPUT''', the '''protocol is: tcp''', and the '''destination is: port 80'''.
:* Basically all other services that you learn to install, configure, and maintain will required the same knowledge just discussed.